Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2019

Retirement Benefits [Abstract]

Net Periodic Benefit Cost

The components of the net periodic benefit cost for our pension and postretirement benefit plans are as follows:

	Pension Plan						Postretirement Benefit Plan
Three Months Ended March 31,	2019			2018			2019			2018
Net periodic benefit cost
Service cost	$	1,997		$	2,175		$	456		$	749
Interest cost	2,080			1,875			319			502
Expected return on plan assets	(2,696		)	(2,625		)	—			—
Amortization of prior service credit	—			—			(2,021		)	(1,352		)
Amortization of net loss	901			1,071			223			589
Net periodic benefit cost	$	2,282		$	2,496		$	(1,023	)	$	488